History stack

The History of changes module, in the darkroom left panel, shows and lets you navigate the history stack of the current image.

It lists every change of state — a module being enabled, disabled, moved, or having a parameter changed — for the current image, newest at the top. Each entry is one user change, so a module can appear several times.

Navigating the history

• Click an entry to return the image to that point in its history.
• Shift+click an entry to expand the corresponding module in the right-hand panel without changing the current edit — useful for inspecting a step.
• Hover an entry for a tooltip listing exactly what changed in that step compared to the previous one, which helps track down unintended adjustments.

The selected history state is remembered: it is safe to quit, leave the darkroom or switch image after stepping back, and you will return to the same state.

Compressing, resetting and reusing

These operations now live in the global menu, so they work on the whole selection and not just the open image:

• Compress history (Edit → Compress history) collapses the stack to the shortest sequence reproducing the current image.
• Delete history (Edit → Delete history) discards the stack and resets the image.
• Create a style (Styles → Create new style…) turns the current history into a reusable style.
• Copy / paste history (Edit → Copy history / Paste history) transfers an edit to other images. See copy and paste history for how the merge works.